<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div>
    <p>123123</p>
  </div>

  <script>
    var div = document.querySelector('div')

    // console.dir(div)

    // console.log( div.innerText )
    // console.log( div.innerHTML )

    // div.innerText = '<h2>qwer</h2>'
    
    div.innerHTML = '<h2>qwer</h2>'
  </script>
</body>
</html>